In the differentiation of a normal female:
A. Müllerian inhibiting substance causes the Müllerian ducts to regress.
B. the uterus and fallopian tubes are formed from the Wolffian ducts.
C. female genitalia form in the absence of hormonal stimulation.
D. the gonads remain undifferentiated throughout fetal life.
E. the SRX protein present on X chromosomes makes the gonads differentiate into ovaries.
C
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One of the main differences between a somatic reflex and autonomic reflex is the type of effectors that are activated. The effectors in somatic reflexes are _____, while the effectors in autonomic reflexes are _____
a) skeletal muscles; smooth muscle, cardiac muscle, and glands b) striated muscles; smooth muscle and glands c) skeletal muscles and glands; smooth muscle and cardiac muscle d) glands; skeletal muscles, smooth muscle, and cardiac muscle e) skeletal muscles; smooth muscle only
A young couple has had regular, unprotected sexual intercourse for 4 years, without a pregnancy
They are seeking help at an assisted reproduction/in vitro fertilization clinic for infertility. The husband is very serious about weight training and physical fitness. Semen analysis reveals a sperm count of 10 million/ml (i.e., very low). His blood analysis reveals an elevated testosterone level. The psychiatrist at the clinic suspects that the husband injects (i.e., abuses) testosterone (T), which turns out to be true. The husband has read online that T stimulates spermatogenesis, and so is confused as to why he has a low sperm count. This is explained based on: A. injected T must first be converted to DHT in the testis B. high levels of injected T are toxic to sperm C. injected T increases levels of sex hormone–binding globulin (SHBG), thereby reducing the "free" T level D. injected T inhibits intratesticular production of T E. injected T increases circulating estrogen, which inhibits spermatogenesis
A patient excretes a large volume of very dilute urine on a continuing basis. This is may be due to
A) excessive ADH secretion. B) absence of ADH. C) hematuric oliguria. D) overproduction of aldosterone. E) dilation of the afferent arterioles.
The __________ is the connective tissue covering around a single muscle fascicle.
Fill in the blank(s) with the appropriate word(s).